RAD 12 – Secondary Surveillance Radar (SSR) – LMS

📄 Detailed Notes ⚡ Cheat Sheet

Results

📄 Notes ⚡ Cheat Sheet

Q1. With SSR interrogation and response signals?

Are standard frequencies separated by 60 MHz

Are separated by 63 MHz

Must be set by the pilot but are always 63 Mhz apart

Are at variable frequencies set by the controller but are always 63 Mhz apart

Are standard frequencies separated by 60 MHz

Q2. *”Fruiting” is caused by?

An airplane's transponder responding to side lobes or reflections of the interrogation signal

Doppler effect on targets moving radially towards or away from the SSR

Airplanes in close proximity responding to the same interrogator

Airplanes at range responding to interrogations from another ATC SSR units

Airplanes at range responding to interrogations from another ATC SSR units. Fruiting : interference caused by replies to other interrogation. ►Two interogator one transponder ► This is interference at one interrogator caused by replies from a transponder responding to interrogations from another interrogator.

Q3. SSR is not affected by weather clutter because?

It uses different frequencies for transmission and reception

The wavelength is too short to be reflected from cloud droplets

The equipment uses a moving target indicator

The frequency used penetrates clouds

It uses different frequencies for transmission and reception

Q4. *** Which one of the following switch positions should be used when selecting a code on the Transponder?

STBY (Standby)

OFF

IDENT (Identification)

NORMAL

STBY (Standby)

Q5. ***When both SSR and primary radar is presented on the controller’s display?

The SSR information is more accurate in bearing and distance

The primary radar information is superfluous

Altitude information is presented for all targets

The primary radar information is more accurate in bearing and distance

The primary radar information is more accurate in bearing and distance – The primary radar element of the ATC Surveillance Radar System provides detection of suitable targets with good accuracy in bearing and range measurement as compare to SSR, but with certain limitations

Q6. What most affects the range available from secondary surveillance radar?

The transmission power of the ground interrogator

The transmission power of the aircraft interrogator

The height of the aircraft and the height of the ground interrogator

The PRR

The height of the aircraft and the height of the ground interrogator – maximum range – PRI/PRF usable range – Line of sight – HTx and HRx

Q7. Which statement is correct with respect to selections on the transponder control panel?

With the selector knobs the four digits of the squawk can be selected using the decimal symbols 0 through 9

With ON selected a reply in the modes A, C, and S, can be transmitted

The correct ICAO 24 bits aircraft address code must be inserted on the control panel

With ALT selected a reply in the modes A, C, and S, can be transmitted

Q8. Which of the following statements regarding Mode S is most correct?

Mode S transponders reduce R/T traffic and also provide the aircraft with a datalink facility

Mode S and Mode A/C transponders use different frequencies in operation

Mode S transponders are used with the radio altimeter

Mode S is used to assist GPS calculations

Mode S transponders reduce $R/T$ traffic and also provide the aircraft with a datalink facility

Q9. When the ATC transponder “IDENT” button is pressed by the pilot?

The airplane's echo on the controller's display will flash or "fill in"

Mode A will automatically be selected

The controller will be urged to identify the airplane

The airplane's identification will be sent to all SSR within range

The airplane’s echo on the controller’s display will flash or “fill in”

Q10. #Secondary surveillance radar (SSR) information is?

Not displayed on a screen but received by fax at the radar controller's station

Displayed on the same screen as primary radar information

Not mandatory for aircraft operating in controlled airspace

Displayed on a screen next to the primary radar screen

Displayed on the same screen as primary radar information

Q11. *The selection of code 2000 on an aircraft SSR transponder indicates:

Entry into airspace from an area where SSR operation has not been required

An emergency

Unlawful interference with the planned operation of the flight

Transponder malfunction

Entry into airspace from an area where SSR operation has not been required

Q12. The ATC transponder system, excluding Mode S, contains:

Four modes, each 1024 codes

Four modes, each 4096 codes

Two modes, each 1024 codes

Two modes, each of 4096 codes

Q13. Data transmission and exchange is conducted on?

Mode D

Mode A

Mode C

Mode S

Q14. The spacing between two pulses transmitted by an SSR interrogator decides?

The identification of the SSR

The ATC code to be sent to the aircraft

What mode is used

What service may be provided by the SSR

What mode is used

Q15. If the SSR transponder IDENT button is pressed:

an identification pulse is automatically and continuously transmitted for 20 seconds, 4.35 µs after the last framing pulse

an identification pulse is automatically and continuously transmitted for 10 seconds, 4.35 µs after the last framing pulse

an identification pulse is automatically and continuously transmitted for 20 seconds, 4.35 µs before the last framing pulse

it causes a momentary distinctive display to appear on the controller's screen

an identification pulse is automatically and continuously transmitted for 20 seconds, 4.35 µs after the last framing pulse

Q16. ***A TCAS II equipped aircraft will have mode S because?

The datalink is required to co-ordinate evasive manoeuvres

True altitude is obtained from mode S

Mode S transmits a 3D position

The datalink is required to transmit relative position

The datalink is required to co-ordinate evasive manoeuvres

Q17. #The frequency of an SSR ground transmission is:

1050+/-0.5Mhz

1120+/-0.6Mhz

1090 +/-0.3 Mhz

1030+/-0.2Mhz

1030 +/-0.2 Mhz

Q18. In the SSR terminology “de-fruiting” means?

Displaying only airplanes with a selected destination

Removing all different colours from the display, making it a mono-colour display

The removal from the display of random responses

Displaying only airplanes changing altitude

The removal from the display of random responses

Q19. * When Mode C is selected on the aircraft SSR transponder the additional information transmitted is:

Height based on QFE

Flight level based on 1013.25 hPa

Altitude based on regional QNH

Aircraft height based on sub-scale setting

Flight level based on 1013.25 hPa

Q20. #A mode S transponder will?

Not respond to modes A or C because it is on a different frequency

Respond normally to mode A or C interrogations

Respond to mode A interrogations but not to mode C

Not respond to interrogations on mode A

Respond normally to mode A or C interrogations

Q21. In the SSR response, the operation of the transponder ident button?

Sends out a special pulse after the normal pulse train

Sends out a special pulse before the normal pulse train

Transmits the airplane's registration or flight number as a data sequence

Sends out a special pulse in the X position in the pulse train

Sends out a special pulse after the normal pulse train

Q22. *When an aircraft is operating is Secondary Surveillance Radar in Mode C an air traffic controller’s presentation gives information regarding the aircraft’s indicated flight level that is accurate to within:

(+ or-100 FT)

(+ or-75 FT)

(+ or -50 FT)

(+ 04-25 FT)

(+ or – 50 FT)

Q23. # The availability of 4096 codes in SSR is applicable to Mode?

C and S

All of three A,C and S

S and C

A and C

All of three A,C and S

Q24. Secondary Surveillance Radar is a form of…….. radar with. ………..type emissions operating in the………… band.

primary; pulse; SHF

secondary; pulse; UHF

secondary; FM; SHF

primary; pulse; UHF

secondary; pulse; UHF

Q25. The transponder code set in an SSR system consists of?

4 digits, forming any of 7777 different codes

4 digits, forming any of 9999 different codes

4 digits, forming any of 4096 different codes

2 digits and 2 letters, forming any of 4096 different codes

4 digits, forming any of 4096 different codes

Q26. Which statement with respect to interrogation modes is correct?

Intermode A/C/S all call and intermode A/C only all call, differ in the pulse spacing used between the P1 and P3 pulses

Mode S Selective will trigger replies of all mode S transponders. Mode A/C transponders are suppressed

Mode S only all-call will trigger transponder replies of all A/C/S transponders

Mode S Broadcast will transmit information to all mode S transponders

Q27. %When a Mode C check is carried out, and assuming the equipment is working without error, the Mode C will report a pressure altitude of 35 064 feet as?

FL35064

FL3506

FL350

FL351

Q28. Garbling is caused by?

Doppler effect on targets moving radially towards or away from the SSR

Airplanes in close proximity responding to the same interrogator

Airplanes at range responding to interrogations from another ATC SSR units

An airplane's transponder responding to side lobes or reflections of the interrogation signal

Airplanes in close proximity responding to the same interrogator

Q29. Which of the following equipment works on the interrogator/transponder principle?

Aerodrome Surface Movement Radar

Airborne Weather Radar (AWR)

Global Positioning System (GPS)

Secondary Surveillance Radar (SSR)

Q30. *Mode A or C garbling may occur to?

Two or more aircraft in different directions from the ground station with a difference in slant range of less than 1.7 nm

Two or more aircraft in the same direction from the interrogator with a difference in slant range of less than 1.7 nm

Two or more aircraft in the same direction from the ground station with a difference in slant range of less than 1.7 nm

Two or more aircraft in different directions from the interrogator with a difference in slant range of less than 1.7 nm

Two or more aircraft in the same direction from the interrogator with a difference in slant range of less than 1.7 nm

Q31. #What is the maximum number of usable Secondary Surveillance Radar (SSR) transponder codes?

7600

4096

1000

3600

4096

Q32. When using SSR the ground controller will ask the pilot to cancel mode C if there is a discrepancy of more………….. than between the altitude detected by the radar from the reply pulses and the altitude reported by the pilot read from an altitude with the subscale set to…………..

100 ft Regional QNH

300 ft 1013 HPa

50 ft 1013 HPa

300 ft Regional QNH

300 ft 1013 HPa

Q33. ## With Mode S, each aircraft can be uniquely interrogated and identified by using the?

24 bits address code, giving more than 16 million possible combinations

Twelve-pulse train giving 212 possible codes

Special Position Identification (SPI) pulse

Long $(30.25~m/sec)$ P3 pulse

24 bits address code, giving more than 16 million possible combinations

Q34. The special SSR codes are as follows: emergency ………, radio failure ……, unlawful interference with the conduct of the flight……….

7700, 7600, 7500

7600, 7500 7700

7500, 7600, 7700

7700, 7600, 7500

Q35. *The two main design functions of Secondary Surveillance Radar (SSR) Mode S are:

Continuous automatic position reporting using global Positioning System (GPS) satellites and collision avoidance using TCAS II

Collision avoidance using TCAS II and improved long range (HF) communication capability

The elimination of ground to air communications and the introduction of automatic separation between aircraft using TCAS II

Air to ground and ground to air data link communications and improved ATC aircraft surveillance capability

Q36. When an aircraft is operating its secondary surveillance radar SSR in Mode C an air traffic controller’s presentation gives information regarding the aircraft’s indicated flight level in increments of?

200 ft

250 ft

100 ft

150 ft

100 ft

Q37. What SSR Mode A code should be selected when entering European airspace from an area where no code has been allocated?

7500

oooo

7000

2000

Q38. Which of the following Secondary Surveillance Radar (SSR) codes is used to indicate transponder malfunction?

7600

oooo

9999

4096

oooo

Q39. ## Secondary radars require:

a target which will respond to the interrogation, and this target may be either an aircraft or a ground-based transponder

a target which will respond to the interrogation, and this target will always be an aircraft

a target which will respond to the interrogation, and this target will always be ground based

a quiescent target

a target which will respond to the interrogation, and this target may be either an aircraft or a ground-based transponder

Q40. *The code transmitted by an SSR transponder consists of:

Pulses

Frequency differences

Phase differences

Amplitude differences

Pulses

Q41. With normal SSR Mode, A coding the aircraft replies by sending back a train of 12 pulses contained between 2 framing pulses with?

Up to 2048 codes in 4 boxes

Up to 4096 codes in 12 boxes

Up to 4096 code in 8 boxes

Up to 4096 codes in 4 boxes

Q42. Why is the effect of returns from storms not a problem with SSR?

By the use of MTI to remove stationary and slow moving returns

The frequency is too high

SSR does not use the echo principle

The PRF is jittered

SSR does not use the echo principle

Q43. *On a typical computer-generated SSR display the following data on a particular flight will be shown?

Squawk code, flight level, ground speed, airplane callsign

Squawk code, magnetic heading, ground speed, airplane callsign

Destination, flight level, ground speed, airplane callsign

Squawk code, flight level, true heading, airplane callsign

Squawk code, flight level, ground speed, airplane callsign

Q44. What information may be displayed on an ATC radar screen connected only to a primary radar system?

Aircraft position, SSR code and altitude

Aircraft altitude

Aircraft positions and SSR code

Aircraft positions only

Q45. **Consider the following statements on SSR Mode S?

Mode S will be able to address any particular one of some 16 million aircraft

Mode S will have the ability to transmit short messages from the ground to a particular aircraft

A Mode S interrogator, when installed, will also collected data from old Mode A and C transponders

All of the statements are correct

Q46. A secondary radar can provide up to 4096 different codes. These 4096 codes can be used in?

All modes

Mode A only

Mode S

Mode C only

All modes

Q47. SSR in ATC use?

Replaces primary radar

Suffers from greater attenuation than primary radar, due to the higher frequencies used

Uses primary radar techniques

Is complementary to primary radar

Q48. What are the frequencies used for interrogation and response for SSR?

1030 MHz for interrogation from the ground, 1030 MHz for response from aircraft

1090 MHz for interrogation from the ground, 1030 MHz for response from aircraft

1090 MHz for interrogation from the ground, 1090 MHz for response from aircraft

1030 MHz for interrogation from the ground, 1090 MHz for response from aircraft

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Results

Q1. With SSR interrogation and response signals?

Q2. *”Fruiting” is caused by?

Q3. SSR is not affected by weather clutter because?

Q4. *** Which one of the following switch positions should be used when selecting a code on the Transponder?

Q5. ***When both SSR and primary radar is presented on the controller’s display?

Q6. What most affects the range available from secondary surveillance radar?

Q7. Which statement is correct with respect to selections on the transponder control panel?

Q8. Which of the following statements regarding Mode S is most correct?

Q9. When the ATC transponder “IDENT” button is pressed by the pilot?

Q10. #Secondary surveillance radar (SSR) information is?

Q11. *The selection of code 2000 on an aircraft SSR transponder indicates:

Q12. The ATC transponder system, excluding Mode S, contains:

Q13. Data transmission and exchange is conducted on?

Q14. The spacing between two pulses transmitted by an SSR interrogator decides?

Q15. If the SSR transponder IDENT button is pressed:

Q16. ***A TCAS II equipped aircraft will have mode S because?

Q17. #The frequency of an SSR ground transmission is:

Q18. In the SSR terminology “de-fruiting” means?

Q19. * When Mode C is selected on the aircraft SSR transponder the additional information transmitted is:

Q20. #A mode S transponder will?

Q21. In the SSR response, the operation of the transponder ident button?

Q22. *When an aircraft is operating is Secondary Surveillance Radar in Mode C an air traffic controller’s presentation gives information regarding the aircraft’s indicated flight level that is accurate to within:

Q23. # The availability of 4096 codes in SSR is applicable to Mode?

Q24. Secondary Surveillance Radar is a form of…….. radar with. ………..type emissions operating in the………… band.

Q25. The transponder code set in an SSR system consists of?

Q26. Which statement with respect to interrogation modes is correct?

Q27. %When a Mode C check is carried out, and assuming the equipment is working without error, the Mode C will report a pressure altitude of 35 064 feet as?

Q28. Garbling is caused by?

Q29. Which of the following equipment works on the interrogator/transponder principle?

Q30. *Mode A or C garbling may occur to?

Q31. #What is the maximum number of usable Secondary Surveillance Radar (SSR) transponder codes?

Q32. When using SSR the ground controller will ask the pilot to cancel mode C if there is a discrepancy of more………….. than between the altitude detected by the radar from the reply pulses and the altitude reported by the pilot read from an altitude with the subscale set to…………..

Q33. ## With Mode S, each aircraft can be uniquely interrogated and identified by using the?

Q34. The special SSR codes are as follows: emergency ………, radio failure ……, unlawful interference with the conduct of the flight……….

Q35. *The two main design functions of Secondary Surveillance Radar (SSR) Mode S are:

Q36. When an aircraft is operating its secondary surveillance radar SSR in Mode C an air traffic controller’s presentation gives information regarding the aircraft’s indicated flight level in increments of?

Q37. What SSR Mode A code should be selected when entering European airspace from an area where no code has been allocated?

Q38. Which of the following Secondary Surveillance Radar (SSR) codes is used to indicate transponder malfunction?

Q39. ## Secondary radars require:

Q40. *The code transmitted by an SSR transponder consists of:

Q41. With normal SSR Mode, A coding the aircraft replies by sending back a train of 12 pulses contained between 2 framing pulses with?

Q42. Why is the effect of returns from storms not a problem with SSR?

Q43. *On a typical computer-generated SSR display the following data on a particular flight will be shown?

Q44. What information may be displayed on an ATC radar screen connected only to a primary radar system?

Q45. **Consider the following statements on SSR Mode S?

Q46. A secondary radar can provide up to 4096 different codes. These 4096 codes can be used in?

Q47. SSR in ATC use?

Q48. What are the frequencies used for interrogation and response for SSR?

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